# Throttle Body sizes.

**URL:** <https://forums.speedlife.net/t/throttle-body-sizes/81700>\
**Category:** SON240sx Automotive\
**Created:** [October 1, 2004, 6:19am UTC](https://forums.speedlife.net/t/throttle-body-sizes/81700 "2004-10-01T06:19:48Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![nocwage](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nocwage/32/5489_2.png) [@nocwage](https://forums.speedlife.net/u/nocwage)\
**Post date:** [October 1, 2004, 6:19am UTC](https://forums.speedlife.net/t/throttle-body-sizes/81700/1 "2004-10-01T06:19:48Z")

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Anyone know if there were differences between the sizes of the throttle bodies (the butterfly valve part) between the SRs, KAs, CAs etc?

A buddy of mine has a Plymouth Acclaim and he went junk yard hunting and went from a 46mm to a 56mm TB…

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**Author:** ![AnDrEw](https://avatars.discourse-cdn.com/v4/letter/a/f19dbf/32.png) [@AnDrEw](https://forums.speedlife.net/u/AnDrEw)\
**Post date:** [October 1, 2004, 9:01am UTC](https://forums.speedlife.net/t/throttle-body-sizes/81700/2 "2004-10-01T09:01:15Z")

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KA is bigger than the CA one IIRC. I don’t know about SR

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**Author:** ![mr200](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mr200/32/5495_2.png) [@mr200](https://forums.speedlife.net/u/mr200)\
**Post date:** [October 1, 2004, 9:49am UTC](https://forums.speedlife.net/t/throttle-body-sizes/81700/3 "2004-10-01T09:49:39Z")

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KA is 60mm

CA is smaller … 48 I think?

SR IIRC is 50 or 55mm?

Vgs are also 55mm I think

KAs still have the biggest

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**Author:** ![nocwage](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nocwage/32/5489_2.png) [@nocwage](https://forums.speedlife.net/u/nocwage)\
**Post date:** [October 1, 2004, 9:51am UTC](https://forums.speedlife.net/t/throttle-body-sizes/81700/4 "2004-10-01T09:51:02Z")

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I guess if I find one cheap off a parts car it’d help intake a little better?

Would it really make much of a difference on a forced induction car?

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**Author:** ![AnDrEw](https://avatars.discourse-cdn.com/v4/letter/a/f19dbf/32.png) [@AnDrEw](https://forums.speedlife.net/u/AnDrEw)\
**Post date:** [October 1, 2004, 9:53am UTC](https://forums.speedlife.net/t/throttle-body-sizes/81700/5 "2004-10-01T09:53:45Z")

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> [@nocwage](#):
>
> I guess if I find one cheap off a parts car it’d help intake a little better?
> 
> Would it really make much of a difference on a forced induction car?

the bigger the better for high end. Paired with upgrading to 3in downpipe and exhaust you will notice a difference 😉

The throttle body will probably not make a noticable difference. If you want to make more power on that CA, put an FMIC on her, and open up the exhaust.

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**Author:** ![mr200](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mr200/32/5495_2.png) [@mr200](https://forums.speedlife.net/u/mr200)\
**Post date:** [October 1, 2004, 9:55am UTC](https://forums.speedlife.net/t/throttle-body-sizes/81700/6 "2004-10-01T09:55:57Z")

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well … it depends on how small the CA DE’s are.

On my ET it was tiny ~40mm

I went to the KA, ported the manifold to match (without doing this, the mod is useless)

But yeah, on my car it was a pretty decent upgrade. Faster throttle response, better spool, and the car did seem to pull in 3rd gear a bit harder.

I just like having everything on the car 2.5" 😉